--- a/lib/Makefile.am
+++ b/lib/Makefile.am
@@ -12,7 +12,7 @@
 fu_SOURCES = getdate.c getline.c posixtm.c argmatch.c backupfile.c \
 dirname.c fileblocks.c filemode.c \
 full-write.c getversion.c idcache.c \
-isdir.c long-options.c makepath.c modechange.c \
+isdir.c long-options.c makepath.c modechange.c path-concat.c \
 safe-read.c save-cwd.c savedir.c stripslash.c userspec.c xgetcwd.c \
 xmalloc.c xstrdup.c xstrtol.c xstrtoul.c yesno.c
 
@@ -20,7 +20,7 @@
 
 noinst_HEADERS = argmatch.h backupfile.h error.h fnmatch.h fsusage.h \
 getline.h getopt.h group-member.h long-options.h makepath.h modechange.h \
-mountlist.h obstack.h pathmax.h save-cwd.h xstrtol.h xstrtoul.h
+mountlist.h obstack.h path-concat.h pathmax.h save-cwd.h xstrtol.h xstrtoul.h
 
 BUILT_SOURCES = getdate.c posixtm.c